<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>验证用户输入的密码</title>
    <script>
      var password = prompt('请输入密码：');
      if (password == '123456') {
        alert('密码输入正确！');
      } else {
        alert('密码输入错误！');
      }
    </script>
  </head>
  <body></body>
</html>